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EP1777528B1 - Semiconductor sensor - Google Patents

Semiconductor sensor Download PDF

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Publication number
EP1777528B1
EP1777528B1 EP05766267A EP05766267A EP1777528B1 EP 1777528 B1 EP1777528 B1 EP 1777528B1 EP 05766267 A EP05766267 A EP 05766267A EP 05766267 A EP05766267 A EP 05766267A EP 1777528 B1 EP1777528 B1 EP 1777528B1
Authority
EP
European Patent Office
Prior art keywords
integrated circuit
semiconductor
circuit substrate
semiconductor integrated
weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP05766267A
Other languages
German (de)
French (fr)
Other versions
EP1777528A4 (en
EP1777528A1 (en
Inventor
Masahide HOKURIKU ELECTRIC INDUSTRY CO LTD TAMURA
Masato HOKURIKU ELECTRIC INDUSTRY CO. LTD. ANDO
Yuichi HOKURIKU ELECTRIC INDUSTRY CO LTD ISHIKURO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hokuriku Electric Industry Co Ltd
Original Assignee
Hokuriku Electric Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hokuriku Electric Industry Co Ltd filed Critical Hokuriku Electric Industry Co Ltd
Publication of EP1777528A1 publication Critical patent/EP1777528A1/en
Publication of EP1777528A4 publication Critical patent/EP1777528A4/en
Application granted granted Critical
Publication of EP1777528B1 publication Critical patent/EP1777528B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P1/00Details of instruments
    • G01P1/02Housings
    • G01P1/023Housings for acceleration measuring devices
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/0061Electrical connection means
    • G01L19/0069Electrical connection means from the sensor to its support
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/02Arrangements for preventing, or for compensating for, effects of inclination or acceleration of the measuring device; Zero-setting means
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/02Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
    • G01P15/08Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
    • G01P15/12Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by alteration of electrical resistance
    • G01P15/123Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by alteration of electrical resistance by piezo-resistive elements, e.g. semiconductor strain gauges
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/02Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
    • G01P15/08Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
    • G01P2015/0805Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration
    • G01P2015/0822Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration for defining out-of-plane movement of the mass
    • G01P2015/084Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration for defining out-of-plane movement of the mass the mass being suspended at more than one of its sides, e.g. membrane-type suspension, so as to permit multi-axis movement of the mass
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42Wire connectors; Manufacturing methods related thereto
    • H01L2224/47Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/49Structure, shape, material or disposition of the wire connectors after the connecting process of a plurality of wire connectors
    • H01L2224/491Disposition
    • H01L2224/4912Layout
    • H01L2224/49175Parallel arrangements
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/73Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
    • H01L2224/732Location after the connecting process
    • H01L2224/73251Location after the connecting process on different surfaces
    • H01L2224/73265Layer and wire connectors
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/15Details of package parts other than the semiconductor or other solid state devices to be connected
    • H01L2924/161Cap
    • H01L2924/1615Shape
    • H01L2924/16195Flat cap [not enclosing an internal cavity]

Definitions

  • the present invention relates to a semiconductor sensor, and especially to a semiconductor sensor capable of detecting acceleration in a predetermined direction that is caused by an externally-added force and gravitational acceleration in a predetermined direction that is applied with the semiconductor sensor being inclined in a stationary state, or relates to a semiconductor sensor used as a gyroscope.
  • Patent Document 1 discloses a pressure sensor structure which comprises a semiconductor pressure sensor including a diaphragm portion in a central portion thereof and a cylindrical support portion in an outer peripheral portion thereof, a plate-like semiconductor integrated circuit substrate which is electrically connected with the semiconductor pressure sensor for processing a signal outputted therefrom, and a casing for receiving the semiconductor pressure sensor and the semiconductor integrated circuit substrate.
  • the semiconductor pressure sensor is installed on the semiconductor integrated circuit substrate by joining the support portion of the semiconductor pressure sensor on a front surface of the semiconductor integrated circuit substrate.
  • a support portion of a semiconductor sensor element of the semiconductor sensor may be installed on a semiconductor integrated circuit substrate.
  • a diaphragm portion may be damaged by the motion of the weight.
  • An object of the present invention is to provide a semiconductor sensor capable of preventing the diaphragm portion from being damaged by the motion of the weight even if the weight collides against the surface of the semiconductor integrated circuit substrate.
  • Another object of the present invention is to provide a semiconductor sensor capable of preventing the diaphragm portion from being bent significantly even if the semiconductor sensor element is disposed in a distorted or deformed casing.
  • a semiconductor sensor comprises a semiconductor sensor element, a semiconductor integrated circuit substrate, and a casing made of an electrical insulating material for receiving the semiconductor sensor element and the semiconductor integrated circuit substrate.
  • the semiconductor sensor element includes a support portion, a diaphragm portion having an outer peripheral portion which is supported by the support portion and made of a semiconductor material, a weight arranged in a central portion of the diaphragm portion, and a sensor element formed in the diaphragm portion and made of a diffused resistor.
  • the semiconductor integrated circuit substrate is electrically connected with the semiconductor sensor element for processing a signal outputted therefrom.
  • a rear surface of the semiconductor integrated circuit substrate is joined onto a wall surface of the casing that defines a receiving chamber of the casing.
  • the support portion of the semiconductor sensor element is joined onto a front surface of the semiconductor integrated circuit substrate. Furthermore, a shock absorbing layer is formed on the front surface of the semiconductor integrated circuit substrate at least on a portion thereof facing the weight of the semiconductor sensor element, for suppressing bouncing of the weight when the weight collides against the semiconductor integrated circuit substrate.
  • the shock absorbing layer when the shock absorbing layer is formed on the front surface of the semiconductor integrated circuit substrate on the portion thereof facing the weight, even if the weight collides against the semiconductor integrated circuit substrate, the shock absorbing layer buffers or absorbs an impact of the collision, thereby suppressing bouncing of the weight. In this manner, the motion of the weight is suppressed or restrained so that the diaphragm portion can be prevented from being damaged. Furthermore, since the semiconductor sensor element is disposed on the semiconductor integrated circuit substrate, even if the casing is distorted or deformed, an adhesive is applied to fill up an uneven gap formed between the distorted or deformed casing and the semiconductor integrated circuit substrate, thereby maintaining flatness of the front surface of the semiconductor integrated circuit substrate. With this arrangement, even when the semiconductor sensor element is disposed inside the distorted or deformed casing, the diaphragm portion of the semiconductor sensor element is prevented from being bent significantly.
  • the shock absorbing layer may also work to protect the front surface of the semiconductor integrated circuit substrate.
  • the diaphragm may be prevented from being damaged since the motion of the weight is suppressed, and additionally, a p-type layer, an n-type layer, and other layers, which are formed in the front surface of the semiconductor integrated circuit substrate, may be protected from external forces.
  • the shock absorbing layer may be made of a polyimide resin since the motion of the weight may not only be suppressed but also the front surface of the semiconductor integrated circuit substrate may be protected.
  • the shock absorbing layer may preferably be 1 to 10 ⁇ m in thickness. If the thickness thereof is less than 1 ⁇ m, it is hard for the shock absorbing layer to sufficiently suppress the bouncing of the weight. If the thickness exceeds 10 ⁇ m, the shock absorbing layer may crack easily.
  • the support portion and the semiconductor integrated circuit substrate may be adhered to each other with a silicon-based adhesive. In this manner, stress which is generated due to a change in temperature between the support portion and the semiconductor integrated circuit substrate may be reduced, thereby alleviating the stress applied from the adhered portion to the semiconductor sensor element.
  • FIG. 1 is a plan view of the semiconductor sensor according to an embodiment of the present invention, when applied to an acceleration sensor.
  • FIG. 2 is a cross-sectional view as taken along line II-II of FIG. 1 .
  • a lid portion 11 which will be described later, is omitted from the illustration in FIG. 1 .
  • FIGS. 1 are plan views of the semiconductor sensor according to an embodiment of the present invention, when applied to an acceleration sensor.
  • FIG. 2 is a cross-sectional view as taken along line II-II of FIG. 1 .
  • a lid portion 11 which will be described later, is omitted from the illustration in FIG. 1 .
  • the semiconductor sensor of this embodiment comprises: a semiconductor sensor element including a sensor body 1, a weight 3, and a pedestal portion 5; a semiconductor integrated circuit substrate 7 on which the pedestal portion 5 is installed; a casing 9 for receiving the semiconductor integrated circuit substrate 7 therein; and a lid portion 11 made of a metal which covers an opening of the casing 9.
  • the sensor body 1 is formed by anisotropic etching from a semiconductor crystal substrate made of single crystal silicon.
  • the sensor body 1 includes a weight fixing portion 13 located in a central portion thereof, a cylindrical supporting part 15 located in an outer peripheral portion thereof, and a flexible diaphragm portion 17 located between the weight fixing portion 13 and the supporting part 15.
  • the support portion is constituted by the supporting part 15 and the pedestal portion 5.
  • a plurality of sensor elements respectively made of a diffused resistor for detecting acceleration are formed on the diaphragm portion 17 on the surface of the sensor body 1.
  • a plurality of electrodes are formed on the supporting part 15.
  • the diaphragm portion 17 is bent when the weight 3 is moved due to acceleration caused by an externally-added force or by a force based on gravitational acceleration applied with the semiconductor sensor being inclined in a stationary state. Resistance values of the respective diffused resistors constituting the sensor element will accordingly vary. Thus, three-axis accelerations are detectable based on the amount of the bending of the diaphragm portion.
  • the weight fixing portion 13 is shaped to protrude from the diaphragm portion 17 toward the weight 3.
  • the weight fixing portion 13 has a polygonal cross section, and its outer peripheral surface is inclined away from the supporting part 15 as it is becoming more distant from a side where the diaphragm portion 17 is located.
  • the supporting part 15 is an annular rectangle in shape, and its inner peripheral surface is constituted by four trapezoidal inclined surfaces 19 of a substantially identical shape which are annularly combined so as to define an outer peripheral surface of a truncated pyramidal internal space of the supporting part 15.
  • the inclined surfaces 19 are inclined toward a centerline C, which will be described later, as they become closer to the side where the diaphragm portion 17 is located.
  • the weight 3 is made of tungsten, having a disc-like outline.
  • the weight is fixed to the weight fixing portion 13 in such a manner that the centerline C passing through the center of the weight fixing portion 13 and extending in a direction orthogonal to an extending direction of the diaphragm portion 17 may also pass through the center of gravity of the weight 3.
  • the weight 3 integrally includes a fixed portion 21 which is fixed to the weight fixing portion 13 and a body portion 23 disposed apart from the diaphragm portion 17 with a space therebetween.
  • the fixed portion 21 is columnar in shape, having a top face fixed to the weight fixing portion 13.
  • the body portion 23 is substantially cylindrical in shape, having an annular top face 23a and a side face 23b defining the circumference of the body portion 23.
  • the top face 23a is located higher than the fixed portion 21.
  • An angle portion 25 formed between the top face 23a and the side face 23b closely faces the inclined surfaces 19 of the supporting part 15.
  • the pedestal portion 5 is an annular rectangle in shape, and is connected with the supporting part 15 to receive the supporting part 15 thereon.
  • An inner peripheral surface of the pedestal portion 5 is constituted by four trapezoidal inclined surfaces 27 of a substantially identical shape which are annularly combined so as to define an outer peripheral surface of a truncated pyramidal space.
  • the inclined surfaces 27 are inclined toward the centerline C as they become closer to the side where the diaphragm portion 17 is located.
  • the semiconductor integrated circuit substrate 7 has a substantially rectangular plate-like shape, including a flat front surface 7a.
  • the semiconductor integrated circuit substrate 7 is formed in such a manner that a circuit including a p-type layer, an n-type layer, an electrode layer, and other layers is partially exposed on the front surface 7a.
  • the pedestal portion 5 is installed on the front surface 7a, facing the weight 3. In this embodiment, the front surface 7a and the pedestal portion 5 are adhered to each other by a silicon-based adhesive.
  • a shock absorbing layer 29 is formed on the front surface 7a in an area thereof surrounded by the pedestal portion 5.
  • the shock absorbing layer 29 is made of a polyimide resin, and has a thickness dimension of 1 to 10 ⁇ m.
  • the shock absorbing layer 29 works to suppress bouncing of the weight 3 when the weight 3 collides against the semiconductor integrated circuit substrate 7, and also to protect the front surface 7a of the semiconductor integrated circuit substrate 7.
  • the shock absorbing layer 29 is formed on the front surface 7a only in the area surrounded by the pedestal portion 5, it may be sufficient to form the shock absorbing layer on the front surface 7a of the semiconductor integrated circuit substrate 7 at least on a portion thereof facing the weight. Accordingly, the shock absorbing layer may be formed all over the front surface of the semiconductor integrated circuit substrate, or all over the whole surface of the semiconductor integrated circuit substrate.
  • the casing 9 is made of a ceramics material and has a rectangular bottom wall 9a and four side walls 9b rising from the edge of the bottom wall 9a.
  • a rectangular bottom portion 9c, on which the semiconductor integrated circuit substrate 7 is disposed, is formed in a central portion of the bottom wall 9a.
  • An annular bottom portion 9d is formed around the rectangular bottom portion 9c to be located in a different level from that of the rectangular bottom portion 9c.
  • a rear surface of the semiconductor integrated circuit substrate 7 and a wall surface of the bottom wall 9a of the casing 9 are adhered to each other with an epoxy-based adhesive.
  • a plurality of electrodes are disposed on a surface of the annular bottom portion 9d.
  • Electrodes disposed on the annular bottom portion 9d and the plurality of electrodes disposed on the supporting part 15 are electrically connected by conductive wires 31.
  • other electrodes disposed on the surface of the annular bottom portion 9d and the plurality of electrodes disposed on the semiconductor integrated circuit substrate 7 are electrically connected by electric conduction wires 33.
  • the shock absorbing layer 29 since the shock absorbing layer 29 is formed on the front surface 7a of the semiconductor integrated circuit substrate 7, even if the weight 3 moves up and down to collide against the semiconductor integrated circuit substrate 7, the shock absorbing layer 29 may buffer or absorb an impact of the collision, thereby suppressing the bouncing of the weight 3. In this manner, the motion of the weight 3 may be suppressed or restrained, thereby preventing the diaphragm portion 17 from being damaged.
  • the semiconductor sensor element is disposed on the semiconductor integrated circuit substrate 7, even if the bottom wall 9a of the casing 9 is distorted or deformed, an adhesive is applied to fill up an uneven gap formed between the distorted or deformed bottom wall 9a and the semiconductor integrated circuit substrate 7, thereby preventing the semiconductor integrated circuit substrate 7 from being distorted or deformed.
  • the flatness of the front surface 7a can be maintained. In this manner, even if the semiconductor sensor element is disposed inside the distorted or deformed casing 9, the diaphragm portion 17 of the semiconductor sensor element can be prevented from being significantly bent.
  • the shock absorbing layer 29 is formed on the front surface 7a of the semiconductor integrated circuit substrate 7.
  • a protective layer 135 for protecting the circuit including a p-type layer etc. may be formed on the front surface 7a of the semiconductor integrated circuit substrate 7 and the shock absorbing layer 129 may be formed on the protective layer 135 as shown in FIG. 4 .
  • the present invention is applied to the semiconductor sensor provided with the pedestal portion 5.
  • the present invention is also applicable to a semiconductor sensor without a pedestal portion.
  • a supporting part will be installed on the front surface of the semiconductor integrated circuit substrate.
  • the present invention it is possible to suppress the bouncing of the weight even if the weight collides against the semiconductor integrated circuit substrate since the shock absorbing layer buffers or absorbs an impact of the collision. Accordingly, displacement of the weight is suppressed or restrained and the diaphragm portion can be prevented from being damaged. In addition, even if the semiconductor sensor element is disposed in the distorted or deformed casing, the diaphragm portion of the semiconductor sensor element can be prevented from being significantly bent.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Pressure Sensors (AREA)
  • Measuring Fluid Pressure (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)

Abstract

A semiconductor sensor of the present invention is capable of preventing a diaphragm portion of t

Description

    TECHNICAL FIELD
  • The present invention relates to a semiconductor sensor, and especially to a semiconductor sensor capable of detecting acceleration in a predetermined direction that is caused by an externally-added force and gravitational acceleration in a predetermined direction that is applied with the semiconductor sensor being inclined in a stationary state, or relates to a semiconductor sensor used as a gyroscope.
  • RELATED ART
  • Japanese Patent No. 3278926 (Patent Document 1) discloses a pressure sensor structure which comprises a semiconductor pressure sensor including a diaphragm portion in a central portion thereof and a cylindrical support portion in an outer peripheral portion thereof, a plate-like semiconductor integrated circuit substrate which is electrically connected with the semiconductor pressure sensor for processing a signal outputted therefrom, and a casing for receiving the semiconductor pressure sensor and the semiconductor integrated circuit substrate. In the pressure sensor structure, the semiconductor pressure sensor is installed on the semiconductor integrated circuit substrate by joining the support portion of the semiconductor pressure sensor on a front surface of the semiconductor integrated circuit substrate.
    • Patent Document 1: Japanese Patent No. 3278926
    DISCLOSURE OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION
  • As with the conventional pressure sensor structure, in a semiconductor sensor provided with a weight, it is contemplated that a support portion of a semiconductor sensor element of the semiconductor sensor may be installed on a semiconductor integrated circuit substrate. However, if the weight collides against the surface of the semiconductor integrated circuit substrate and bounces largely, a diaphragm portion may be damaged by the motion of the weight.
  • An object of the present invention is to provide a semiconductor sensor capable of preventing the diaphragm portion from being damaged by the motion of the weight even if the weight collides against the surface of the semiconductor integrated circuit substrate.
  • Another object of the present invention is to provide a semiconductor sensor capable of preventing the diaphragm portion from being bent significantly even if the semiconductor sensor element is disposed in a distorted or deformed casing.
  • MEANS FOR SOLVING THE PROBLEMS
  • A semiconductor sensor according to the present invention comprises a semiconductor sensor element, a semiconductor integrated circuit substrate, and a casing made of an electrical insulating material for receiving the semiconductor sensor element and the semiconductor integrated circuit substrate. The semiconductor sensor element includes a support portion, a diaphragm portion having an outer peripheral portion which is supported by the support portion and made of a semiconductor material, a weight arranged in a central portion of the diaphragm portion, and a sensor element formed in the diaphragm portion and made of a diffused resistor. The semiconductor integrated circuit substrate is electrically connected with the semiconductor sensor element for processing a signal outputted therefrom. A rear surface of the semiconductor integrated circuit substrate is joined onto a wall surface of the casing that defines a receiving chamber of the casing. The support portion of the semiconductor sensor element is joined onto a front surface of the semiconductor integrated circuit substrate. Furthermore, a shock absorbing layer is formed on the front surface of the semiconductor integrated circuit substrate at least on a portion thereof facing the weight of the semiconductor sensor element, for suppressing bouncing of the weight when the weight collides against the semiconductor integrated circuit substrate.
  • According to the present invention, when the shock absorbing layer is formed on the front surface of the semiconductor integrated circuit substrate on the portion thereof facing the weight, even if the weight collides against the semiconductor integrated circuit substrate, the shock absorbing layer buffers or absorbs an impact of the collision, thereby suppressing bouncing of the weight. In this manner, the motion of the weight is suppressed or restrained so that the diaphragm portion can be prevented from being damaged. Furthermore, since the semiconductor sensor element is disposed on the semiconductor integrated circuit substrate, even if the casing is distorted or deformed, an adhesive is applied to fill up an uneven gap formed between the distorted or deformed casing and the semiconductor integrated circuit substrate, thereby maintaining flatness of the front surface of the semiconductor integrated circuit substrate. With this arrangement, even when the semiconductor sensor element is disposed inside the distorted or deformed casing, the diaphragm portion of the semiconductor sensor element is prevented from being bent significantly.
  • It is preferred that the shock absorbing layer may also work to protect the front surface of the semiconductor integrated circuit substrate. In this manner, the diaphragm may be prevented from being damaged since the motion of the weight is suppressed, and additionally, a p-type layer, an n-type layer, and other layers, which are formed in the front surface of the semiconductor integrated circuit substrate, may be protected from external forces.
  • Various kinds of materials may be used for the shock absorbing layer. It is preferred that the shock absorbing layer may be made of a polyimide resin since the motion of the weight may not only be suppressed but also the front surface of the semiconductor integrated circuit substrate may be protected.
  • In this case, the shock absorbing layer may preferably be 1 to 10 µm in thickness. If the thickness thereof is less than 1 µm, it is hard for the shock absorbing layer to sufficiently suppress the bouncing of the weight. If the thickness exceeds 10 µm, the shock absorbing layer may crack easily.
  • It is preferred that the support portion and the semiconductor integrated circuit substrate may be adhered to each other with a silicon-based adhesive. In this manner, stress which is generated due to a change in temperature between the support portion and the semiconductor integrated circuit substrate may be reduced, thereby alleviating the stress applied from the adhered portion to the semiconductor sensor element.
  • BRIEF DESCRIPTION OF THE DRAWINGS
    • FIG. 1 is a plan view of a semiconductor sensor according to one embodiment of the present invention, when applied to an acceleration sensor.
    • FIG. 2 is a cross-sectional view as taken along line II-II of FIG. 1.
    • FIG. 3 is an enlarged partial cross-sectional view of the semiconductor sensor shown in FIG. 1.
    • FIG. 4 is an enlarged partial cross-sectional view of a semiconductor sensor according to another embodiment of the present invention.
    BEST MODE FOR CARRYING OUT THE INVENTION
  • Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 is a plan view of the semiconductor sensor according to an embodiment of the present invention, when applied to an acceleration sensor. FIG. 2 is a cross-sectional view as taken along line II-II of FIG. 1. For ease of understanding, a lid portion 11, which will be described later, is omitted from the illustration in FIG. 1. As shown in FIGS. 1 and 2, the semiconductor sensor of this embodiment comprises: a semiconductor sensor element including a sensor body 1, a weight 3, and a pedestal portion 5; a semiconductor integrated circuit substrate 7 on which the pedestal portion 5 is installed; a casing 9 for receiving the semiconductor integrated circuit substrate 7 therein; and a lid portion 11 made of a metal which covers an opening of the casing 9. The sensor body 1 is formed by anisotropic etching from a semiconductor crystal substrate made of single crystal silicon. The sensor body 1 includes a weight fixing portion 13 located in a central portion thereof, a cylindrical supporting part 15 located in an outer peripheral portion thereof, and a flexible diaphragm portion 17 located between the weight fixing portion 13 and the supporting part 15. In this embodiment, the support portion is constituted by the supporting part 15 and the pedestal portion 5.
  • A plurality of sensor elements respectively made of a diffused resistor for detecting acceleration are formed on the diaphragm portion 17 on the surface of the sensor body 1. A plurality of electrodes are formed on the supporting part 15. In the semiconductor sensor of this embodiment, the diaphragm portion 17 is bent when the weight 3 is moved due to acceleration caused by an externally-added force or by a force based on gravitational acceleration applied with the semiconductor sensor being inclined in a stationary state. Resistance values of the respective diffused resistors constituting the sensor element will accordingly vary. Thus, three-axis accelerations are detectable based on the amount of the bending of the diaphragm portion.
  • The weight fixing portion 13 is shaped to protrude from the diaphragm portion 17 toward the weight 3. The weight fixing portion 13 has a polygonal cross section, and its outer peripheral surface is inclined away from the supporting part 15 as it is becoming more distant from a side where the diaphragm portion 17 is located.
  • The supporting part 15 is an annular rectangle in shape, and its inner peripheral surface is constituted by four trapezoidal inclined surfaces 19 of a substantially identical shape which are annularly combined so as to define an outer peripheral surface of a truncated pyramidal internal space of the supporting part 15. The inclined surfaces 19 are inclined toward a centerline C, which will be described later, as they become closer to the side where the diaphragm portion 17 is located. With the above-described configuration of the inner peripheral surface of the supporting part 15 , the internal space of the supporting part 15 including the weight fixing portion 13 is a truncated pyramid in shape whose cross-sectional area becomes smaller toward the diaphragm portion 17.
  • The weight 3 is made of tungsten, having a disc-like outline. The weight is fixed to the weight fixing portion 13 in such a manner that the centerline C passing through the center of the weight fixing portion 13 and extending in a direction orthogonal to an extending direction of the diaphragm portion 17 may also pass through the center of gravity of the weight 3. The weight 3 integrally includes a fixed portion 21 which is fixed to the weight fixing portion 13 and a body portion 23 disposed apart from the diaphragm portion 17 with a space therebetween. The fixed portion 21 is columnar in shape, having a top face fixed to the weight fixing portion 13. The body portion 23 is substantially cylindrical in shape, having an annular top face 23a and a side face 23b defining the circumference of the body portion 23. The top face 23a is located higher than the fixed portion 21. An angle portion 25 formed between the top face 23a and the side face 23b closely faces the inclined surfaces 19 of the supporting part 15. With this arrangement, if the weight 3 is caused to move more than necessary, the angle portion 25 of the weight 3 gets in contact with the inclined surfaces 19 of the supporting part 15 and displacement of the weight 3 will consequently be limited within a predetermined range.
  • The pedestal portion 5 is an annular rectangle in shape, and is connected with the supporting part 15 to receive the supporting part 15 thereon. An inner peripheral surface of the pedestal portion 5 is constituted by four trapezoidal inclined surfaces 27 of a substantially identical shape which are annularly combined so as to define an outer peripheral surface of a truncated pyramidal space. The inclined surfaces 27 are inclined toward the centerline C as they become closer to the side where the diaphragm portion 17 is located.
  • As shown in FIG. 3, the semiconductor integrated circuit substrate 7 has a substantially rectangular plate-like shape, including a flat front surface 7a. The semiconductor integrated circuit substrate 7 is formed in such a manner that a circuit including a p-type layer, an n-type layer, an electrode layer, and other layers is partially exposed on the front surface 7a. The pedestal portion 5 is installed on the front surface 7a, facing the weight 3. In this embodiment, the front surface 7a and the pedestal portion 5 are adhered to each other by a silicon-based adhesive. A shock absorbing layer 29 is formed on the front surface 7a in an area thereof surrounded by the pedestal portion 5. The shock absorbing layer 29 is made of a polyimide resin, and has a thickness dimension of 1 to 10 µm. The shock absorbing layer 29 works to suppress bouncing of the weight 3 when the weight 3 collides against the semiconductor integrated circuit substrate 7, and also to protect the front surface 7a of the semiconductor integrated circuit substrate 7. In this embodiment, although the shock absorbing layer 29 is formed on the front surface 7a only in the area surrounded by the pedestal portion 5, it may be sufficient to form the shock absorbing layer on the front surface 7a of the semiconductor integrated circuit substrate 7 at least on a portion thereof facing the weight. Accordingly, the shock absorbing layer may be formed all over the front surface of the semiconductor integrated circuit substrate, or all over the whole surface of the semiconductor integrated circuit substrate.
  • The casing 9 is made of a ceramics material and has a rectangular bottom wall 9a and four side walls 9b rising from the edge of the bottom wall 9a. A rectangular bottom portion 9c, on which the semiconductor integrated circuit substrate 7 is disposed, is formed in a central portion of the bottom wall 9a. An annular bottom portion 9d is formed around the rectangular bottom portion 9c to be located in a different level from that of the rectangular bottom portion 9c. In this embodiment, a rear surface of the semiconductor integrated circuit substrate 7 and a wall surface of the bottom wall 9a of the casing 9 are adhered to each other with an epoxy-based adhesive. A plurality of electrodes are disposed on a surface of the annular bottom portion 9d. Some of the electrodes disposed on the annular bottom portion 9d and the plurality of electrodes disposed on the supporting part 15 are electrically connected by conductive wires 31. Similarly, other electrodes disposed on the surface of the annular bottom portion 9d and the plurality of electrodes disposed on the semiconductor integrated circuit substrate 7 are electrically connected by electric conduction wires 33.
  • According to the semiconductor sensor of this embodiment, since the shock absorbing layer 29 is formed on the front surface 7a of the semiconductor integrated circuit substrate 7, even if the weight 3 moves up and down to collide against the semiconductor integrated circuit substrate 7, the shock absorbing layer 29 may buffer or absorb an impact of the collision, thereby suppressing the bouncing of the weight 3. In this manner, the motion of the weight 3 may be suppressed or restrained, thereby preventing the diaphragm portion 17 from being damaged. In addition, since the semiconductor sensor element is disposed on the semiconductor integrated circuit substrate 7, even if the bottom wall 9a of the casing 9 is distorted or deformed, an adhesive is applied to fill up an uneven gap formed between the distorted or deformed bottom wall 9a and the semiconductor integrated circuit substrate 7, thereby preventing the semiconductor integrated circuit substrate 7 from being distorted or deformed. Thus, the flatness of the front surface 7a can be maintained. In this manner, even if the semiconductor sensor element is disposed inside the distorted or deformed casing 9, the diaphragm portion 17 of the semiconductor sensor element can be prevented from being significantly bent.
  • In the above-mentioned embodiment, the shock absorbing layer 29 is formed on the front surface 7a of the semiconductor integrated circuit substrate 7. A protective layer 135 for protecting the circuit including a p-type layer etc. may be formed on the front surface 7a of the semiconductor integrated circuit substrate 7 and the shock absorbing layer 129 may be formed on the protective layer 135 as shown in FIG. 4.
  • In the above-mentioned embodiment, the present invention is applied to the semiconductor sensor provided with the pedestal portion 5. The present invention is also applicable to a semiconductor sensor without a pedestal portion. In this case, a supporting part will be installed on the front surface of the semiconductor integrated circuit substrate.
  • INDUSTRIAL APPLICABILITY
  • According to the present invention, it is possible to suppress the bouncing of the weight even if the weight collides against the semiconductor integrated circuit substrate since the shock absorbing layer buffers or absorbs an impact of the collision. Accordingly, displacement of the weight is suppressed or restrained and the diaphragm portion can be prevented from being damaged. In addition, even if the semiconductor sensor element is disposed in the distorted or deformed casing, the diaphragm portion of the semiconductor sensor element can be prevented from being significantly bent.

Claims (5)

  1. A semiconductor sensor capable of detecting acceleration comprising:
    a semiconductor sensor element including:
    a support portion (15);
    a diaphragm portion (17) having an outer peripheral portion which is supported by the support portion (15), and made of a semiconductor material;
    a weight (3) arranged in a central portion of the diaphragm portion (17); and
    a sensor element formed in the diaphragm portion (17) and made of a diffused resistor;
    a semiconductor integrated circuit substrate (7) electrically connected with the semiconductor sensor element for processing a signal outputted therefrom; and
    a casing (9) made of an electrical insulating material for receiving the semiconductor sensor element and the semiconductor integrated circuit substrate (7), characterised in that:
    a rear surface of the semiconductor integrated circuit substrate (7) is joined onto a wall surface of the casing (9) that defines a receiving chamber of the casing (9);
    the support portion (15) of the semiconductor sensor element is joined onto a front surface (7a) of the semiconductor integrated circuit substrate (7); and
    a shock absorbing layer (29) is formed on the front surface of the semiconductor integrated circuit substrate (7) at least on a portion thereof facing the weight (3) of the semiconductor sensor element, for suppressing bouncing of the weight (3) when the weight (3) collides against the semiconductor integrated circuit substrate (7).
  2. The semiconductor sensor according to claim 1, wherein the shock absorbing layer (29) also works to protect the front surface (7a) of the semiconductor integrated circuit substrate (7).
  3. The semiconductor sensor according to claim 2, wherein the shock absorbing layer (29) is made of a polyimide resin.
  4. The semiconductor sensor according to claim 3, wherein a thickness of the shock absorbing layer (29) is 1 to 10 µm.
  5. The semiconductor sensor according to claim 1, wherein the support portion (15) and the semiconductor integrated circuit substrate (7) are adhered to each other with a silicon-based adhesive.
EP05766267A 2004-07-21 2005-07-21 Semiconductor sensor Not-in-force EP1777528B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004212891 2004-07-21
PCT/JP2005/013362 WO2006009194A1 (en) 2004-07-21 2005-07-21 Semiconductor sensor

Publications (3)

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EP1777528A1 EP1777528A1 (en) 2007-04-25
EP1777528A4 EP1777528A4 (en) 2010-08-18
EP1777528B1 true EP1777528B1 (en) 2011-11-23

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EP05766267A Not-in-force EP1777528B1 (en) 2004-07-21 2005-07-21 Semiconductor sensor

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US (1) US7640807B2 (en)
EP (1) EP1777528B1 (en)
JP (1) JPWO2006009194A1 (en)
AT (1) ATE534914T1 (en)
WO (1) WO2006009194A1 (en)

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Also Published As

Publication number Publication date
US7640807B2 (en) 2010-01-05
JPWO2006009194A1 (en) 2008-05-01
EP1777528A4 (en) 2010-08-18
EP1777528A1 (en) 2007-04-25
ATE534914T1 (en) 2011-12-15
WO2006009194A1 (en) 2006-01-26
US20070234804A1 (en) 2007-10-11

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